- Picture Books
- Ages 3–7
- Contemporary

Big Bright Feelings: Milo's Monster
Book 6 of 10 in Big Bright FeelingsView the full series
Milo has the perfect best friend, until his best friend makes a new friend. His jealousy grows into an actual monster. Tom Percival's most honest exploration of the ugly side of friendship, and what to do when you can't control how you feel.
- Best for3–7
- FormatPicture
- Length32 pp
- Read aloud~6 min
The vibe
What it’s like.
Style
- Lyrical
- Conversational
- Repetitive
Tone
- Warm
- Gentle
- Heartwarming
- Thought provoking
- Inspirational
Themes
Experience meters
What’s it about?
The story.
Milo and his best friend are inseparable. Then his best friend makes another friend, and something dark and green and lumpy starts to grow. The monster is Milo's jealousy made visible, a physical presence that follows him around, getting bigger the more he feeds it. Tom Percival's visual device here is particularly effective: the monster is recognisably the feeling rather than something external, and readers will understand what it represents before the book makes it explicit. The resolution asks Milo to face what he's feeling and name it, and shows that naming a feeling is often the first step to loosening its grip. A useful book for the specific situation of a child whose best friend has found another friend, which is one of the more painful and hard-to-talk-about experiences of early childhood. Also useful for conversations about jealousy more broadly, and for children who struggle to understand why they behave badly when they feel threatened.
Fit check
Right for your child?
Where it lands by age
- 1
- 3
- 5
- 7
- 9
- 11
- 13
- Best fit · 3–7
- Read aloud · 3–8
- Independent · 5–7
Prose load
Light
Visual support
Very high
Reluctant-reader friendly
Workable
Read-aloud quality
Excellent
Works well for
- Reading aloud
- Reading together
Nothing in the book is likely to concern most parents. Safe to recommend without preview.
Bedtime suitability
3 / 5 · Workable
Sensitive-child
5 / 5 · Good fit
Graphic intensity
1 / 5 · None
Best for
- Jealousy
- Friendship difficulties
- Discussion starter
- Gift book
- Pshe resource
Avoid if
No common reasons to avoid this one — a rare clean sweep on the sensitivity flags.
Particularly good for children who are…
- Making friends
- New sibling
- Anxiety and worry
- Being bullied
In the classroom
How it works in school.
Tom Percival's flagship emotional-literacy series — each picture book explores a big feeling (worry, anger, shyness, jealousy and more), making them the go-to PSHE read-alouds.
A book children love that happens to support school — never a stand-in for the texts a class is taught with. Reviewed for the classroom · June 2026.
Why it lands
Why they love it.
Why kids love it
The specific recognition is your best friend making a new friend — Milo's jealousy growing into an actual green monster that follows him around, getting bigger every time he tries not to look at it. The Big Bright Feelings for the painful moment a child discovers their best friend isn't only theirs.
- Being special or chosen
- Being understood finally
- Friendship and belonging
Why parents love it
The Big Bright Feelings on jealousy — Milo's friend-shift jealousy externalised as a monster that grows with feeding. Particularly useful for the specific situation of a best friend acquiring another best friend, which is one of the more hard-to-talk-about feelings of early childhood.
- Conversation starter
- Bedtime appropriate
- Quick to read
- Great writing
In the series
Big Bright Feelings.
10 books · open the series →
About the author & illustrator
Tom Percival.
If you liked this
Three ways out of this book.
If you liked this, try…
Lateral matches. Same shelf, different texture.
Come into this from…
Easier or preparing reads — perfect lead-ins.
Where to go next…
Escalation reads — a step up in scale, silliness, or stakes.
More like this…
Books that share themes and topics with this one.
Where you’ll find it
On these reading lists.
Buy or borrow
Pick up a copy.
- Bookshop.org ↗
- Waterstones ↗
- Amazon UK ↗
- Hive ↗
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